The present invention relates to a fixed orthodontic space regainer that may be used during the mixed dentition period in the mandibular arch. It is indicated in cases where the first primary molar (or first premolar) has migrated mesially into the canine space following early loss of the adjacent primary canine. The appliance termed as the �Lingual arch crossbow� consists of a lingual arch, molar tubes, curved stainless steel wire and NiTi open coil springs. The appliance is cemented on to the mandibular permanent first molars. The curved wire along with NiTi open coil springs help in retracting the concerned tooth (first primary molar or first premolar) until the lost canine space is regained.
